Development of a 300 L Calibration Bath for Oceanographic Thermometers

  • S. BabaEmail author
  • K. Yamazawa
  • T. Nakano
  • I. Saito
  • J. Tamba
  • T. Wakimoto
  • K. Katoh
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science


The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has been developing a 300 L calibration bath to calibrate 24 oceanographic thermometers (OT) simultaneously and thereby reduce the calibration work load necessary to service more than 180 OT every year. This study investigated characteristics of the developed 300 L calibration bath using a SBE 3plus thermometer produced by an OT manufacturer. We also used 11 thermistor thermometers that were calibrated to be traceable to the international temperature scale of 1990 (ITS-90) within 1 mK of standard uncertainty through collaboration of JAMSTEC and NMIJ/AIST. Results show that the time stability of temperature of the developed bath was within \(\pm 1 \,\hbox {mK}\). Furthermore, the temperature uniformity was \(\pm 1.3 \,\hbox {mK}\). The expanded uncertainty (\(k=2\)) components for the characteristics of the developed 300 L calibration bath were estimated as 2.9 mK, which is much less than the value of 10 mK: the required specification for uncertainty of calibration for the OT. These results demonstrated the utility of this 300 L calibration bath as a device for use with a new calibration system.


Calibration bath Comparison calibration Stability Uncertainty Uniformity Water temperature 



We greatly appreciate comments related to the scientific background of this study by Iwao Ueki. We also thank Shoko Tatamisashi and Koki Uda (Marine Works Japan Ltd.) for operating this calibration bath and for assisting with temperature accuracy measurements in the bath.


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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Japan Agency for Marine-Earth Science and Technology (JAMSTEC)YokosukaJapan
  2. 2.National Institute of Technology and EvaluationTokyoJapan
  3. 3.National Metrology Institute of Japan (NMIJ)AISTTsukubaJapan
  4. 4.Osaka City UniversityOsakaJapan

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